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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018 Macronix
*
* Author: Boris Brezillon <boris.brezillon@bootlin.com>
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mtd/spinand.h>
#define SPINAND_MFR_MACRONIX 0xC2
#define MACRONIX_ECCSR_MASK 0x0F
static SPINAND_OP_VARIANTS(read_cache_variants,
SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
static SPINAND_OP_VARIANTS(write_cache_variants,
SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
SPINAND_PROG_LOAD(true, 0, NULL, 0));
static SPINAND_OP_VARIANTS(update_cache_variants,
SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
SPINAND_PROG_LOAD(false, 0, NULL, 0));
static int mx35lfxge4ab_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *region)
{
return -ERANGE;
}
static int mx35lfxge4ab_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *region)
{
if (section)
return -ERANGE;
region->offset = 2;
region->length = mtd->oobsize - 2;
return 0;
}
static const struct mtd_ooblayout_ops mx35lfxge4ab_ooblayout = {
.ecc = mx35lfxge4ab_ooblayout_ecc,
.free = mx35lfxge4ab_ooblayout_free,
};
static int mx35lf1ge4ab_get_eccsr(struct spinand_device *spinand, u8 *eccsr)
{
struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0x7c, 1),
SPI_MEM_OP_NO_ADDR,
SPI_MEM_OP_DUMMY(1, 1),
SPI_MEM_OP_DATA_IN(1, eccsr, 1));
int ret = spi_mem_exec_op(spinand->spimem, &op);
if (ret)
return ret;
*eccsr &= MACRONIX_ECCSR_MASK;
return 0;
}
static int mx35lf1ge4ab_ecc_get_status(struct spinand_device *spinand,
u8 status)
{
struct nand_device *nand = spinand_to_nand(spinand);
u8 eccsr;
switch (status & STATUS_ECC_MASK) {
case STATUS_ECC_NO_BITFLIPS:
return 0;
case STATUS_ECC_UNCOR_ERROR:
return -EBADMSG;
case STATUS_ECC_HAS_BITFLIPS:
/*
* Let's try to retrieve the real maximum number of bitflips
* in order to avoid forcing the wear-leveling layer to move
* data around if it's not necessary.
*/
if (mx35lf1ge4ab_get_eccsr(spinand, &eccsr))
return nand->eccreq.strength;
if (WARN_ON(eccsr > nand->eccreq.strength || !eccsr))
return nand->eccreq.strength;
return eccsr;
default:
break;
}
return -EINVAL;
}
static const struct spinand_info macronix_spinand_table[] = {
SPINAND_INFO("MX35LF1GE4AB", 0x12,
NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
NAND_ECCREQ(4, 512),
SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
&write_cache_variants,
&update_cache_variants),
SPINAND_HAS_QE_BIT,
SPINAND_ECCINFO(&mx35lfxge4ab_ooblayout,
mx35lf1ge4ab_ecc_get_status)),
SPINAND_INFO("MX35LF2GE4AB", 0x22,
NAND_MEMORG(1, 2048, 64, 64, 2048, 40, 2, 1, 1),
NAND_ECCREQ(4, 512),
SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
&write_cache_variants,
&update_cache_variants),
SPINAND_HAS_QE_BIT,
SPINAND_ECCINFO(&mx35lfxge4ab_ooblayout, NULL)),
};
static int macronix_spinand_detect(struct spinand_device *spinand)
{
u8 *id = spinand->id.data;
int ret;
/*
* Macronix SPI NAND read ID needs a dummy byte, so the first byte in
* raw_id is garbage.
*/
if (id[1] != SPINAND_MFR_MACRONIX)
return 0;
ret = spinand_match_and_init(spinand, macronix_spinand_table,
ARRAY_SIZE(macronix_spinand_table),
id[2]);
if (ret)
return ret;
return 1;
}
static const struct spinand_manufacturer_ops macronix_spinand_manuf_ops = {
.detect = macronix_spinand_detect,
};
const struct spinand_manufacturer macronix_spinand_manufacturer = {
.id = SPINAND_MFR_MACRONIX,
.name = "Macronix",
.ops = ¯onix_spinand_manuf_ops,
};
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